per this channel, there is a divide in PTI's cabinet about it. Some saying allow the vote, while some opposing. The Sec. of the National Assembly has told the Speaker that if voting is not allowed before midnight then even the Sec. of the National Assembly would be target of Article 6 of the Constitution--a severe charge.
Once the Supreme Court rules something, that becomes THE law in Pakistan. Whether they do a 'Judicial Murder' such as that of Zulfi Bhutto or sack or restore Prime Minister, right or wrong, their verdicts become the law.